Help with AJAX

Hello, good day. I am a newbie in AJAX. I am still starting at this programming language. I just want to ask for help. I have a field "From" and "To". If you select "1969" in "From" field, then in "To" field, the user will automatically select YEAR that is greater than "1969. I still have no idea on how to do it. Thank you again in advance. More power!

The most common mistake ever made in this forum: AJAX is not a programming language, it is a set of javascript functions that allow you to send/retrieve data to pages when the page is already loaded. And, for the thing you want, no AJAX is needed: just regular javascript will do the trick.